" 127.The value of "prod(sin(2k pi)/(7)-i cos(2k pi)/(7))=

The value of prod_(k=1)^6((sin)(2pik)/(7)-(icos)(2pik)/(7)) is

Find the value of sin((pi)/(7))sin((2 pi)/(7))sin((4 pi)/(7))=

prod_ (k = 1) ^ (6) (sin ((2k pi) / (7)) - i cos ((2k pi) / (7))) =

The value of sin (pi)/(7)+sin (2 pi)/(7)+sin (3 pi)/(7) is

the value of sin((pi)/(7))+sin((2 pi)/(7))+sin((3 pi)/(7)) is

If the value of cos((2 pi)/(7))+cos((4 pi)/(7))+cos((6 pi)/(7))+cos((7(pi)/(7)))=-(l)/(2) Find the value of l

The value of cos (pi)/(7) . cos (2 pi)/(7) . cos (4 pi)/(7) is

The value of cos (2 pi)/(7)+cos (4 pi)/(7)+cos (6 pi)/(7) is

sum_ (k = 1) ^ (6) (sin, (2 pi k) / (7) -i cos, (2 pi k) / (7)) =?